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https://addons.mozilla.org/en-US/firefox/addon/temporary-con...

The creator and maintainer of that extension has passed away in January.

https://github.com/stoically/temporary-containers/issues/618

Chrome profiles work exactly like this, you can set up any number of profiles and they all have their own configuration/sessions etc.

I use home and work profiles on my laptop for instance, works really well.

private/incognito window?

That forgets the whole session when you close it. I meant a way to isolate websites for tracking purposes but also continue to use it over time rather than throwing away all cookies.

It sounds like Chrome accounts might accomplish this for you. I have 7-8 profiles for different personas that seem to sandbox cookies and other identity-adjacent features quite well.